CN103196834B - With the interference of light gas detecting system of air-pressure balancing device - Google Patents
With the interference of light gas detecting system of air-pressure balancing device Download PDFInfo
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- CN103196834B CN103196834B CN201310122914.0A CN201310122914A CN103196834B CN 103196834 B CN103196834 B CN 103196834B CN 201310122914 A CN201310122914 A CN 201310122914A CN 103196834 B CN103196834 B CN 103196834B
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Abstract
The invention provides a kind of novel light interference gas detect light path system and air-pressure balancing device.Utilize refined quick interference of light principle design, pass through light source, light beam is divided into three beams light through the effect of plane beam splitter by some optical elements such as imageing sensor and plane beam splitter, forms two groups of interference of light stripeds, carries out process obtain measurement result to two groups of stripeds.New air-pressure balancing device is that closed structure can meet the requirement worked long hours in environment for use.The object of the present invention is to provide that a kind of degree of accuracy is high, the interference of light gas detect light path system that manufactures simple, equalization of pressure and air-pressure balancing device.
Description
Technical field
The present invention relates to and adopt optical measurement to be the instrument of its feature, specifically a kind of interference of light gas detecting system with air-pressure balancing device that make use of interference of light principle.
Background technology
The 1950's, the light interference methane tester of RIKEN CORPORATION's development was the most widely used a kind of light interference methane tester of existing market, its light path and physical construction adopt refined quick interference of light principle, directly observe the mode of optical system interference of light move of stripe amount measure methane concentration by negative lens with human eye.This light interference methane tester in use reading relies on mechanical graduated scale human eye reading, and error is large; Its pressure equilibrium be kapillary, pressure equilibrium speed is slow, and can not use in operating environment for a long time.
Publication number is CN2783317Y, publication date is the Chinese utility model patent application documents of 2006-5-24, disclose a kind of interference of light and detect methane or carbon dioxide plant, utilize refined quick principle of interference, add image procossing acquisition and processing unit, but in use there is identical problem with mechanical type methane analyzer, can not use in the work environment for a long time.
Publication number is CN101576489A, and publication date is the Chinese invention patent application file of 2009-11-11, discloses a kind of interference of light and detects methane or carbon dioxide plant.This device make use of Michelson Interference Principle, produces two groups of interference lights.In this device, need to produce a branch of directional light, injecting need precision machined cemented prism.Described light is very high to the requirement of parallel degree, otherwise is difficult to produce satisfactory interference fringe.The quality of the machining precision of described cemented prism directly can affect the appearance of interference fringe, also can affect the radical of interference fringe.In addition, in use procedure, microdisplacement and/or the coming unstuck of cemented surface of light source all can cause the great variety of interference fringe, and then affect the accuracy of measurement result, therefore have that manufacturing cost is higher, the deficiency of poor stability.
The application number being same applicant with the present invention be 2011204170.0 utility model patent disclose a kind of Intelligent light interference gas measuring device, this device adopts light slit that the light that light source penetrates is divided into two-beam a and b, then by gas chamber clapboard, light beam a is divided into a1 and a2 again, then a1, a2 gets back on plane beam splitter respectively through the reflex of refraction right angle prism, interfere with light beam b, although this device is to temperature, the error that pressure and mechanical mechanism cause obtains and effectively suppresses, but owing to adopting gas chamber clapboard, arrow beam of light a is divided into two-beam, difficulty of processing is large, high to instrument and equipment accuracy requirement, be difficult to realize, and when temperature difference becomes large, measured interference fringe shade is thicker, affects measurement result and accuracy, and interference fringe distortion also can cause measurement result to differ with actual value becoming large, this equipment can not use for a long time in measurement environment.
Summary of the invention
For above deficiency of the prior art, the object of the present invention is to provide that a kind of degree of accuracy is high, the interference of light gas detect light path system that manufactures simple, equalization of pressure and air-pressure balancing device, for achieving the above object, technical scheme of the present invention is: a kind of interference of light gas detecting system with air-pressure balancing device, comprise light source, plane beam splitter, air chamber, refractive power right angle prism, reflection right angle prism, imageing sensor and some other optical elements, it also comprises closed pressure equaliser, and wherein pressure equaliser is connected with described air chamber;
Light beam in the light path of described light source, in 45 ° of plane beam splitters installed by light source transmitting and through light slit is divided into the light beam a, light beam b and the light beam c that are parallel to each other;
Fender plate I and fender plate II is also provided with between described air chamber and refractive power right angle prism, described light beam a is through reference gas chamber I, obtain light beam a ˊ by blocking of fender plate I after described light beam a passes reference gas chamber I, described light beam b and light beam a ˊ interferes; Described light beam c obtains light beam c ˊ through after sampling air chamber by blocking of fender plate II, and then light beam c ˊ and light beam b interferes.
Further, described closed pressure equaliser is inflatable and air bag that is that shrink or adjustable air pressure electric device.
Advantage of the present invention and beneficial effect as follows:
The present invention serves the error that temperature, pressure and mechanical mechanism cause and effectively suppresses; And can the electric device of adjustable pressure by arranging a contraction and expansion air bag or one, make equipment can under worse working environment continuous firing, zero point is more stable, improves the durable grade of equipment; By level crossing, light beam is divided into three-beam a, b, c, light beam b and light beam a and c interferes, shadow-free between interference fringe, and accuracy of measurement is higher; Reduce the high-precision requirement to technique, make production more simple and convenient.
Accompanying drawing explanation
Fig. 1 is a kind of interference of light gas detecting system structural representation with air-pressure balancing device of one embodiment of the present invention;
Fig. 2 A is the interference fringe pattern adopting two-beam to carry out interfering sampling before temperature variation; Fig. 2 B is the interference fringe pattern adopting three-beam to carry out interfering sampling before temperature variation;
Fig. 3 A is the interference fringe pattern adopting two-beam to carry out interfering sampling after temperature variation; Fig. 3 B is the interference fringe pattern adopting three-beam to carry out interfering sampling after temperature variation.
Embodiment
The invention will be further elaborated to provide the embodiment of an indefiniteness below in conjunction with accompanying drawing.
With reference to shown in Fig. 1, a kind of interference of light gas detecting system with air-pressure balancing device, comprise the interference of light light path system of light source 4, plane beam splitter 6, air chamber 8, refractive power right angle prism 11, reflection right angle prism 5, imageing sensor 1 and some optical elements composition, it is characterized in that: also comprise closed pressure equaliser 7, wherein pressure equaliser 7 is connected with described air chamber 8;
In the light path of described light source 4, in 45 ° of plane beam splitters 6 installed light source 4 to be launched and light beam through light slit 3 is divided into the light beam a, light beam b and the light beam c that are parallel to each other;
45 ° of faces of the incidence end corresponding flat spectroscope 6 of described air chamber 8, the side of the corresponding refractive power right angle prism 11 of its exit end; Air chamber 8 is separated into reference gas chamber I, reference gas chamber II by gas chamber clapboard I 12 and gas chamber clapboard II 13 and is communicated with the sampling air chamber of sampling apparatus;
Described light beam a is through reference gas chamber I, and obtain light beam a' by blocking of fender plate I 9 after described light beam a passes reference gas chamber I, light beam a' is reflected back toward reference gas chamber II through refractive power right angle prism 11, then arrives the O point on plane beam splitter 6; Described light beam b is through reference gas chamber I or sampling air chamber, and be reflected back toward reference gas chamber II or sampling air chamber through refractive power right angle prism 11, then arrive plane beam splitter 6, be finally reflected to O point, described light beam b and light beam a' interferes;
Described light beam c obtains light beam c' by blocking of baffle plate II 10 after passing sampling air chamber, then reflects into sampling air chamber by refractive power right angle prism 11, and arrive plane beam splitter 6, be finally reflected to O point, then light beam c' and light beam b interferes;
Described light beam b and light beam a' and light beam c' interferes rear formed light beam respectively, is that positive lens 2 arrive imageing sensor 1 through reflection right angle prism 5 and focal length; Light path shown in figure is not limited in certain the present invention, the principle reversible according to light path in optics, incident light source can be arranged at reflection right angle prism 5 place, and corresponding reflection right angle prism 5 can be located at the position of incident light source, can reach the object detecting interference fringe equally.
In the embodiment of the present invention, described pressure equaliser comprises air bag that is inflatable and that shrink or adopts small machine to drive piston to realize the device of air pressure balance, non-closed structure can cause zero point drift after having grown continuous service time, measurement result deviation is very large, inaccurate, the data obtained do not possess reference value.
Principle of work:
Embodiments of the invention to serve the error that temperature, pressure and mechanical mechanism cause effectively suppress owing to having said structure; And by arranging a contraction and expansion air bag, make equipment can under worse working environment continuous firing, improve the durable grade of equipment.Embodiments of the invention are owing to having said structure, when measuring, light source 4 sends a branch of stable white light source, arrive plane beam splitter by light slit 3 and be divided into 3 bundle light, a branch of is reflected light c, a branch of projection light b for casting out after the reflection of backside reflection film, the projection light a of another bundle for casting out after the reflection of backside reflection film, projection light a and reflected light c passes air chamber by reference to after air chamber I, projection light a obtains wherein a part of light through the effect of blocking of dividing plate I9 and becomes light beam a', then reference gas chamber II is reflected back through 360 degree of refractive power right angle prism 11, reference gas chamber II is reflected back through 360 degree of refractive power right angle prism 11 after reflected light c passes reference gas chamber I, light beam c obtains light beam c' by the effect of blocking of baffle plate II 10 after passing sampling air chamber, then reflects into sampling air chamber by refractive power right angle prism 11, then interferes by meeting at O point after the refraction of plane beam splitter and reflection, described light beam b and light beam a' and light beam c' interferes rear formed light beam respectively, is that positive lens 2 arrive imageing sensor 1 through focal length.In above process, refractive power right angle prism can be finely tuned to obtain the interference fringe meeting and measure and require radical, the change of optical path difference will be caused thus the mobile change causing striped because gas refracting index in sampling air chamber changes, gas concentration is larger, moving interference fringes amount is larger, and imageing sensor can change into accessible electric signal picture signal and export.
Fig. 2 A is the interference fringe pattern adopting two-beam to carry out interfering sampling before temperature variation; Fig. 2 B is the interference fringe pattern adopting three-beam to carry out interfering sampling before temperature variation; Fig. 3 A is the interference fringe pattern adopting two-beam to carry out interfering sampling after temperature variation; Fig. 3 B is the interference fringe pattern adopting three-beam to carry out interfering sampling after temperature variation.Can find out significantly, two-beam interference fringe is adopted to form shade, and adopt this device can not form shade, and when after temperature variation, after adopting two-beam interference fringe, shade can broaden, measuring error strengthens, and temperature variation does not affect the interference fringe of this device, the large increase of measuring accuracy.The influence of thermal deformation that three-beam solves physical construction causes the aberration problems of figure, makes subsequent treatment accurately more convenient.Because in use, physical construction can along with the change of temperature, and the passing of service time changes gradually, can cause the distortion of image like this, can cause figure None-identified and process time serious, and instrument cannot use.
These embodiments are interpreted as only being not used in for illustration of the present invention limiting the scope of the invention.After the content of reading record of the present invention, technician can make various changes or modifications the present invention, and these equivalence changes and modification fall into the scope of the claims in the present invention equally.
Claims (2)
1. the interference of light gas detecting system with air-pressure balancing device, comprise light source (4), plane beam splitter (6), air chamber (8), refractive power right angle prism (11), reflection right angle prism (5), imageing sensor (1) and other optical elements some, it is characterized in that: also comprise closed pressure equaliser (7), wherein pressure equaliser (7) is connected with described air chamber (8);
Light beam in the light path of described light source (4), in 45 ° of plane beam splitters (6) installed by light source (4) transmitting and through light slit (3) is divided into the light beam a, light beam b and the light beam c that are parallel to each other;
Fender plate I (9) and fender plate II (10) is also provided with between described air chamber (9) and refractive power right angle prism (11), described light beam a is through reference gas chamber I, obtain light beam a ˊ by blocking of fender plate I (9) after described light beam a passes reference gas chamber I, described light beam b and light beam a ˊ interferes; Described light beam c obtains light beam c ˊ through after sampling air chamber by blocking of fender plate II (10), and then light beam c ˊ and light beam b interferes.
2. the interference of light gas detecting system with air-pressure balancing device according to claim 1, is characterized in that: described closed pressure equaliser (7) is inflatable and air bag that is that shrink or adjustable air pressure electric device.
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CN201310122914.0A CN103196834B (en) | 2013-04-10 | 2013-04-10 | With the interference of light gas detecting system of air-pressure balancing device |
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CN201310122914.0A CN103196834B (en) | 2013-04-10 | 2013-04-10 | With the interference of light gas detecting system of air-pressure balancing device |
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CN103196834B true CN103196834B (en) | 2015-10-28 |
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CN106093311B (en) * | 2016-08-08 | 2019-03-19 | 北京市产品质量监督检验院 | Smell, VOC and floating harmful substance test device |
CN106248880B (en) * | 2016-08-08 | 2018-09-28 | 东莞市升微机电设备科技有限公司 | Smell, VOC and floating harmful substance with External Circulation Filtration Apparatus detect cabin |
CN106370601B (en) * | 2016-08-17 | 2019-12-06 | 北京千安哲信息技术有限公司 | Gaseous wide area detection device |
CN106596470A (en) * | 2016-12-02 | 2017-04-26 | 辽宁工程技术大学 | Portable high-resolution CCD light interference type mash gas detector |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2186398Y (en) * | 1993-11-01 | 1994-12-28 | 胡传镛 | Laser interference harmful gas monitoring end instrument |
CN101354350A (en) * | 2008-09-01 | 2009-01-28 | 陈书乾 | Optical interference type methane detector |
CN202256150U (en) * | 2011-10-27 | 2012-05-30 | 重庆一心仪器仪表有限公司 | Intelligent light interference gas measuring device |
CN203203924U (en) * | 2013-04-10 | 2013-09-18 | 重庆一心仪器仪表有限公司 | Light interference gas detection light path system and gas pressure balance device |
-
2013
- 2013-04-10 CN CN201310122914.0A patent/CN103196834B/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2186398Y (en) * | 1993-11-01 | 1994-12-28 | 胡传镛 | Laser interference harmful gas monitoring end instrument |
CN101354350A (en) * | 2008-09-01 | 2009-01-28 | 陈书乾 | Optical interference type methane detector |
CN202256150U (en) * | 2011-10-27 | 2012-05-30 | 重庆一心仪器仪表有限公司 | Intelligent light interference gas measuring device |
CN203203924U (en) * | 2013-04-10 | 2013-09-18 | 重庆一心仪器仪表有限公司 | Light interference gas detection light path system and gas pressure balance device |
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